Ismat Enterprises

A centrifugal exhaust fan—often called a blower—is a mechanical device used to move air or other gases. Unlike standard axial fans (like a desk fan) that blow air straight through, these fans pull air into the center and then fling it outward at a 90-degree angle using centrifugal force. 
​Think of it like a salad spinner for air.
​How It Works
​The magic happens inside the scroll housing (the "snail shell" shape).  
​Air Intake: Air enters the fan wheel through the center (the eye).
​Acceleration: The rotating blades spin the air, increasing its kinetic energy.
​Pressure Build-up: The air is pushed against the housing, where the velocity slows down and converts into static pressure.
​Discharge: The pressurized air is forced out through the outlet.  Why Use One?
​High Pressure: They are much better at pushing air through long ductwork or filters than axial fans. 
​Durability: Because the motor is often located outside the airflow, they can handle hot, greasy, or corrosive air (perfect for commercial kitchens).
​Customization: You can easily adjust the speed and pressure by changing the pulley ratio or using a Variable Frequency Drive (VFD). 
​Common Applications
​Kitchen Hoods: Pulling heavy grease and heat through filters. 
​Industrial Plants: Moving sawdust, chemical fumes, or grain. 
​HVAC Systems: Pumping air through large office buildings.